Campbell Biology: Concepts & Connections Plus Mastering Biology with Pearson eText - Access Card Package (9th Edition)
9th Edition
ISBN: 9780134240688
Author: Martha R. Taylor, Eric J. Simon, Jean L. Dickey, Kelly A. Hogan, Jane B. Reece
Publisher: PEARSON
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Textbook Question
Chapter 20, Problem 4TYK
Negative-feedback mechanisms are
a. most often involved in maintaining homeostasis.
b. analogous to a furnace that produces heat.
c. found only in birds and mammals.
d. all of the above
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In a negative feedback mechanism,a. the output cancels the input.b. there is a fluctuation above and below the average.c. there is self-regulation.d. a regulatory center communicates with other body parts.e. All of these are correct.
which of the following scenarios can be classified as a negative feedback loop?
a. increase in oxytocin caused by increased contractions
b. increase in blood pressure to reduce heart rate
c. increase in testosterone to help increase a fight or flight response
d. increase in platelet production to help increase blood clotting
a positive-feedback system is one in which
a. a variable is charged in the opposite direction to the original change that initiated the system
b. a variable is changed in the same direction as the original change that initiated the system
c. two opposiding variables are played against each other
d. the initiating variable is always increased
Chapter 20 Solutions
Campbell Biology: Concepts & Connections Plus Mastering Biology with Pearson eText - Access Card Package (9th Edition)
Ch. 20 - Connecting the Concepts 1. There are several key...Ch. 20 - True or false? Each cell in the human body is...Ch. 20 - Prob. 3TYKCh. 20 - Negative-feedback mechanisms are a. most often...Ch. 20 - Briefly explain how the structure of each of these...Ch. 20 - Describe ways in which the bodies of complex...Ch. 20 - Which of the following best illustrates...Ch. 20 - The diaphragm is a large sheet of muscle that...Ch. 20 - Prob. 9TYKCh. 20 - Prob. 10TYK
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- In negative feedback,a. a change causes responses that counteract the change.b. a response to a change damages the body.c. a change produces a response that enhances the change.d. a response to a change permanently alters the body.arrow_forwardWhich of the following is a way that the body determines how much of a certain chemical, protein, enzyme, or response is needed to maintain homeostasis? A. Resource limitation, B. Feedback inhibition, C. Kickback inhibition, D. Signal looparrow_forwardFunctions of human body cells include a. movement. b. covering. c. storage. d. communication. e. All of the choices are correct.arrow_forward
- With negative feedback, detection of a change brings about a response that_____ the change. a. reverses c. has no effect on b. accelerates d. mimicsarrow_forwardMark the following statements as true or false. If a statement is false, correct it to make a true statement. a. Structure and function are closely related at the organ level only. b. Homeostasis is the condition of having a dynamic equilibrium of the internal environment. c. Positive feedback loops are triggered by a deviation from a homeostatic set point and are shut down when conditions return to the set point. d. The effects of negative feedback loops are amplified to create an escalating response. e. Cell-cell communication is required to coordinate the activities of the whole bodyarrow_forwardGive an example of a negative feedback loop: Choose one Group of answer choices: A. Endogones pyrogens inducing fever B. None of the above C. Regulation of Blood Glucose Levels D. Release of Oxytocin in Childbirth E. Sweating when cold F. All of the abovearrow_forward
- 1. Which of the following is one of the four basic cell types in the body? a. respiratory b. epithelial c. endocrine d. integumentary Tile e. immune 2. Which of the following is incorrect? a. Equilibrium requires a constant input of energy. Tile b. Positive feedback is less common in nature than negative feedback. c. Homeostasis does not imply that a given variable is unchanging. d. Fever is an example of resetting a set point. e. Efferent pathways carry information away from the integrating center of a reflex arc.arrow_forwardWhich of the following is an example of negative feedback? A. High blood sugar will increase the viscosity of blood plasma (plasma is concentrated). In response, water is drawn into the plasma from surrounding tissues in order to dilute the plasma B. Breathing rate increases during exercise to provide more oxygen to muscle cells. Heart rate also increase to increase the speed at which the oxygen is delivered. C. During digestion cells in the stomach produce HCl to begin breaking down proteins, the HCl then stimulates the release of pepsin, to continue breaking down proteins. D. In the immune system, antibodies produced by B-cells bind to antigens, which activates other B-cells to produce antibodies of the same kind.arrow_forwardWhich of these statements about homeostasis is true? a.The internal environment is maintained absolutely constant. b.Negative feedback mechanisms act to correct deviations from a normal range within the internal environment. c.Homeostasis is maintained by turning effectors on and off. d.All of these are true.arrow_forward
- Which of the following are examples of maintaining homeostasis (more than one answer may be correct)? a. You develop diarrhea in response to contracting norovirus b. Sweating due to eating spicy food c. Kidneys removing excess fluid through urine d. Insulin is released in response to high blood sugar, causing cells to use more sugararrow_forwardIn negative feedback, the variable being regulated is changed in the ______ direction, while in positive feedback the variable is changed in the ______ direction. A. same, opposite B. negative, positive C. opposite, same D. decreasing, increasingarrow_forwardIn a positive-feedback system the hormone A increases the amount of protein X. Which of the following statements is correct? Group of answer choices a decrease in X always causes a decrease in A, which causes an increase in X. a decrease in A always produces an increase in X, which results in an increase in A. an increase in A always produces an increase in X, which results in an increase in A. an increase in X always produces a decrease in A, which results in a decrease in X.arrow_forward
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